<template>
<div class="category">
<!--  显示所有上架的父分类-->
  <ul>
    <li @click="selectFirstCategory({})" :class="{active: !firstCategorySelected.id}">全部</li>
    <li v-for="(category, index) in firstCategoryList"
        :key="index"
        :class="{active: category.id == firstCategorySelected.id}"
        @click="selectFirstCategory(category)"
    >{{ category.name }}</li>
  </ul>
  <ul v-if="firstCategorySelected.id">
    <li  @click="selectSecondCategory({})" :class="{active: !secondCategorySelected.id}">全部</li>
    <li v-for="(category,index) in secondCategoryList"
        :key="index"
        :class="{active: category.id == secondCategorySelected.id}"
        @click="selectSecondCategory(category)"
    >{{ category.name }}</li>
  </ul>
</div>
  <!-- 显示搜索商品 -->
  <div class="goodsList">
    <ul>
      <li v-for="(goods, index) in pageInfo.list" :key="index" @click="toGoodsView(goods.id)">
        <div class="pic"><el-image :src="`${SERVER_ADDR}/goods/pic/${goods.picList[0].url}`" /></div>
        <div class="name">{{ goods.name }}</div>
        <div class="dscp">{{ goods.dscp }}</div>
        <div class="price">￥ {{ goods.price }}</div>
      </li>
    </ul>

    <el-row class="row-bg" justify="center" style="margin-top:20px ;">
      <el-pagination background layout="prev, pager, next" :total="pageInfo.total"
                     :page-size="pageInfo.pageSize" @change="search"/>
    </el-row>
  </div>

</template>

<script setup>
import {reactive, ref, watch} from "vue";
import categoryApi from "@/api/categoryApi.js";
import goodsApi from "@/api/goodsApi.js";
import {useRouter} from "vue-router";
import {useGoodsStore} from "@/stores/goods.js";

const goodsStore = useGoodsStore()
const  router = useRouter()

const SERVER_ADDR = ref(import.meta.env.VITE_SERVER_ADDR);
//获取通过路径传递的参数
const props = defineProps({
  categoryId: String
});

//所有需要显示的父分类
const firstCategoryList = ref([])
//所有需要显示的子分类
const secondCategoryList =ref([])
//被选中的父分类
const firstCategorySelected = ref({})
//被选中的子分类
const secondCategorySelected = ref({})
//被选中的分类id - 可能是父分类id，也可能是子分类id
const categoryId = ref(null);
//分页信息
const pageInfo = ref({
  pages: 0,
  pageSize: 0,
  pageNum: 0
})


//通过路径参数发送变化进行的处理
watch( props, ()=>{
  getParent()
})

//点击父分类调用的函数
function selectFirstCategory(category){
  firstCategorySelected.value = category
  //只要选择某个父分类，就要清空所有需要显示的子分类
  secondCategoryList.value=[]
  //给被选中的分类id赋值
  if(firstCategorySelected.value.id){
    categoryId.value = firstCategorySelected.value.id;
  } else {
    categoryId.value = null;
  }

  //给被选中的父分类下的子分类赋值
  if(category.childList){
    // secondCategoryList.value=category.childList
    category.childList
        .filter(c => c.status == 1)
        .forEach(c => secondCategoryList.value.push(c))
  }
  //查询商品
  search(1);
}

//点击子分类调用的函数
function selectSecondCategory(category){
  //给选中的子分类赋值
  secondCategorySelected.value = category
  //给被选中的分类id赋值
  if(secondCategoryList.value.id){
    categoryId.value = secondCategoryList.value.id;
  }else{
    categoryId.value = firstCategorySelected.value.id;
  }
  //查询商品
  search(1);
}


//获取父分类
function getParent(){
  const condition={
    parentId: 0,
    status:1,
    recom:1
  }
  categoryApi.selectByPage(condition)
      .then(resp=>{
        firstCategoryList.value=resp.data;
        let flag = true
        firstCategoryList.value.forEach(c => {
          if(props.categoryId == c.id){
            flag = false
            selectFirstCategory(c)
          }
        });
        if(flag == true) {
          selectFirstCategory({});
        }
      });
}
function search(pageNum){

  const condition = {
    name: goodsStore.goodsInfo.value,
    status: 1,
    categoryId: categoryId.value
  };
  goodsApi.selectByPage1(condition,pageNum,20)
      .then(resp =>{
        pageInfo.value = resp.data;
      })
}
function toGoodsView(id) {
  router.push({
    path: '/user/goods',//跳转到的位置，值和页面路由中配置的路径相同
    query: {
      id
    }
  });
}
getParent();
watch(goodsStore, () => {
  search()
});
</script>

<style scoped>

.category ul li{
  float: left;
  margin: 10px 20px ;
  font-size: 14px;
  cursor: pointer;
}
.active{
  color: var(--theme-color);
  font-weight: bold;
}
.goodsList ul li{
  width: 224px;
  float: left;
  margin-right: 20px;
  margin-bottom: 20px;
  text-align: center;
  background-color: #EEE;
  cursor: pointer;
}
.goodsList ul li:hover{
  box-shadow: 0 0 20px #000;
}
.goodsList ul li:nth-child(5n){
  margin-right: 0;
}
.name,.dscp,.price{
  line-height: 25px;
}
 .name{
  font-size: 16px;
  font-weight: bold;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.dscp{
  color: #AAA;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
</style>